Version 3.12.19

Performance and stability improvements on all platforms.

git-svn-id: http://v8.googlecode.com/svn/trunk@12243 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/ChangeLog b/ChangeLog
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+2012-08-01: Version 3.12.19
+
+        Performance and stability improvements on all platforms.
+
+
 2012-07-30: Version 3.12.18
 
         Forced using bit-pattern for signed zero double. (issue 2239)